Reversing mechanism for hoisting drums



g w. SOMMER REvERsmG MECHANIsM Fon HoIsTING DRUMS Filed June 30. 1924 2 Sheets-Sheet 1 f /w m. m

WML/,4M Jon/MSR Wai/WMM vTozNgs/a" g 27 w. SOMMER REVERSING MECHANISM FOR HQISTING DRUMS Filed June 30, 1924` 2 Sheets-Sheet 2 [VVE/fr0? HM M vg E@ f HTTORWEK Patented Aug. 16, 1927.

UNITED STATES 1,639,151 PATENT OFFICE.

WILLIAM SOMMER, OF ST. PAUL, MINNESOTA, ASSIGNOR .TO AMERICAN HOIST & DERRICK COMPANY, A PARTNERSHIP COMPOSED OF F. J'. JOHNSON AND W. 0.

WASHBURN, 0F ST. PAUL, MINNESOTA.

REVERSING MECHANISM FOR HOISTING DRUMS.

Application filed June 30, 1924. Serial No. 723,422.

In the operation of a hoisting apparatus where a winding drum is used to wind up the cable of a bucket or scoop, the weight of the empty bucket is usually relied upon to unwind the cab-le from the drum when it is disconnected from the winding mechanism. This method of unwinding has frequently proved unsatisfactory, being too slow and it is difficult to utilize the swing of the bucket for the purpose of casting it outwardly at some distance from the end of the supporting boom, the drum offering some little fric tional resistance to the pull of the bucket and cable thereon.

The object therefore of my invention is to provide a means for reversingr or revolving the winding drum backwardly to facili tate the unwinding of the cable therefrom A further object is to provide a reversing mechanism of simple economical construction which can be applied to the winding drum of a standard hoisting apparatus.

The invention consists generally in various constructions and combinations all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is a sectional view illustrating the application of my invention to the winding drum of a hoisting apparatus;

Figure 2 is a sectiona"L view on the line 2-2 of Figure 1;

Figure 3 is a sectional view on the line 3-3 of Figure 1.

Figure 4 is a detail sectional view showing the clutch mechanism connecting the drum with the gear wheel In the drawing, 2 represents a suitable base, 3 is a driving pinion mounted on a shaftl 4t that is driven through a disk 5 from a driving rod connection 6 which extends to the source of motive power, not shown. The pinion 3 meshes with a large driving gear 7 which has the usual connection with a winding` drum from which a cable 8 eX- tends to the boom and excavating bucket or scoop. not shown. The winding drum is provided with a brake-drum 9 and a brakeband 10 is arranged to encircle this drum and frictionally engage it when the mechanism for tightening or loosening the band indicated at 11 is operated.

The clutch mechanism between the gear wheel and the drum is of the conventional type and comprises the shoes 9 adapted to engage the internal friction surface provided on the brake drum 9 being normally held out of engagement with such surface by the tension of springs 9. Links 10 connect these shoesI with a hub 10 that is slidable on the shaft of the drum. f

All this apparatus above described is common to hoisting mechanisms and is described merely for the purpose of illustrating the use and operation of my invention.

A bracket 12 is secured to the base 2. A shaft 13 has bearings at one end in saidbracket and in a suitable support 141 provided on said base at the other end of said shaft. A hub 15 is mounted on said shaft and has a pinion 16 normally meshing with the teeth of the gear 7 to be operated thereby, and a similar pinion 17 meshes with a gear 18 mounted on a hub 19 which is rotatably mounted on a shaft 2O carried by a yoke 21 that is journaled on the shaft 13 and is free to oscillate thereon. A friction wheel 22 is mounted on the hub 19 in position to engage the friction surface of the brake-drum 9, said wheel being driven from the pinion 17 and operates on the brake-drum to revolve the drum and gear backwardly and cause the cable to become slack without depending upon the weight of the excavating bucket. If a suitable oscillation or swing is imparted to the bucket by the boom and the cable unwound and released at the right time, the bucket may be cast outwardly a considerable distance in much the same way as the bait and hook is cast by the release of a fishing reel. At such time of course the winding drum will be disengaged from the large gear and through this large gear the pinions and the friction wheel will be driven to effect a reverse mot-ion of the winding drum and the unwinding and delivery of the cable.

The friction wheel and yoke 21 are prefer ably operated by the following mechanism: 23 represents a shaft having au arm 24 pivotally connected by a link 25 with the yoke 21. A treadle arm 26 having a foot-engaging pedal 27 is connected with the shaft 23 and is yieldingly held in normal position by a spring 28. Vhen this arm is depressed by the pressure of the foot of the operator, the yoke and friction wheel will be raised to engage the wheel with the surface of the brake- CID drum and as this Wheel is driven through its pinion connection` with the large gear T, a backward movement ot the Winding` drum Will immediately be `etfected and this vvillcontinue as long as the Lfriction Wheel is in contact with the surface of the brakedrum. As soon as the operator removes his toot from the pedal. the springl 2S Will raise the arm 2G, Withdraw the friction Wheel trom contact With the drum and alloiv the Winding drum to become stationary or it ma7 be connected again with the large `r/jear and the Winding operation resumed, Bv this simple attachment to the Winding mechanism ot a hoistingn apparatus l am able to unwind or remove the cable from the drinn much more rapidly than has been possible heretoiore and deliver `the bucket or scoop at the Work a considerable distance from the end of the supporting boom.

I -clainiasf myinvention 1. A hoisting' apparatus comprising; a Winding drum and cable therefor. said drum having?7 an annular friction surface, means for revolving,` said drum in one direction to Wind the cable thereon, said drum being temporarily disconnected from said revolving means to `allowr backward moi/'ementv` and a friction Wheel engaging s id Winding drui'n 'friction `surface for accelcratina` its haelt- Ward movement to hasten the discharge ot the cable 'from the drum, an oscillating element supporting said Wheel, a pinion carried by said element and connected to said Wheel, and means for oscillatingsaid element and connecting said pinion with said revolving' means.

2. A hoisting apparatus comprising' a Winding drum and cable therefor, and means tor revolving` said drum to Wind the cable thereon, said means comprising a driving` pinion and `ejear, said drum being disronnected from said gear to allow backward movement oif the drmma pinion meshingwith said gear to be driven thereby` an oscillating' yoke, a friction wheel carried by said yoke and adapted to engage an annular friction surtace provided on said drum.y said 'friction Wheel having a driving' connection with said pinion and adapted to accelerate the backward movement oi.: said drum to unyWind said cable, and means Within control ot' the operator 'for oscillating said lvolte to engage .saft d Wheel with said :friction surface.

8. fir drum having; a friction surface.I a drivingl lgear, a clutch for connecting; the gear With the drum, a shaft., a volte swingable on the shaft, said yoke having;l a, friction nf'heel journaled thereon. and enfei'ageable with the 'friction surface and carrying a gear, a daplei; gear en the shaft, connectingthe driving and t'ricton Wheel gears, and means tor contlie voire.

trolling swinging motions ot 4.-. :L hoisting' apparatus comprising a vindingl drum, a driving gear therefor, a clutch mechanism :tor causing' gear and drum to rotate in unison a voire sivinp'alil); mounted and having,Y a friction Wheel enganeahle to drive the drum, said 4triction Wheel hai a gear, and gearing; rotatable on an alms common to the yoke, said gearing arranced to drive the Wheel. and to be driven b '1e drum gear When the voire is swungr toivarc the drum.

'nwitnass whereof, l have hereunto setmy hand this 23rd day of June, 192i.

lILLIAli/I SOMER. 

